This week, Germany experienced its worst terror atrocity since the 1980s, following 21 months of Islamist suicide bombings, shootings, axe attacks, and now a truck rampage.

The terrorist killers responsible have included numerous “refugees” from Syria, Iraq, Afghanistan, and Algeria, as well as several German citizens of Turkish decent indoctrinated in radical Islam. Around seven of the plots and attacks are thought to have been linked to Islamic State.